Method of and means for making machine-glazed paper



METHOD OF AND MEANS FOR MAKING MACHINE GLAZED PAPER Filed April 22. 1926 2 Sheets-Sheet 1 Jule/270*:

j $4710 e n/n4 Sept. 7 1926. 1,598,793

J. M. WARD METHOD OF AND MEANS FOR MAKING MACHINE GLAZED PAPER Filed April 22, 1926 2 Sheets-Sheet 2 oa aer web Patented Sept. 7, 1926.

UNITED STATES PATENT- OFFICE.

JOSEPH M. WARD, OF DETROIT, MICHIGAN, ASSIGNOR TO DETROIT SULPHITE PULP & PAPER (10., OF DETROIT, MICHIGAN, A CORPORATION OF MICHIGAN.

METHOD OF AND MEANS FOR MAKING MACHINE-GLAZED PAPER.

Application filed April 22, 1926.

My invention relates to the manufacture of M. G., or machine glazed, papers, such as are made on a Yankee machine. The paper heretofore made on these machines had a glazed finish on one side and rough on the other.

The purpose of my invention is to improve the finish and quality of machine glazed paper by operations on the rough side to secure a more uniform and smooth finish thereof. A higher grade or quality of paper is thus produced for which there is a greater commercial demand.

To this end my invention contemplates, in its preferred embodiment, the provision of a series of pressure rolls acting progressively on the rough side of the paper on the Yankee drier while there is still sufficient moisture content in the paper to permit working of the fibers on the rough side with out impairing the glazing effect. Said progressive pressure, operating in a deter-. mined relation to the glazing operation, produces a finish on tle rough side of the paper characterized by its smoothness and more uniform and compact arrangement of the fibers.

As my invention becomes better understood by reference to the following description and drawings, it will be appreciated that an improved machine glazed paper is produced and that the novel method dis closed enables practical and economical production of such paper.

Referring to the drawings I Figure 1 is a diagrammatic side elevation. of machinery employed in the practice of my invention;

Fig. 2 is an enlarged side elevation of the pressure rolls acting on the rough side of the paper on the Yankee drier;

Fig. 3 is a vertical section through said rolls and drier; and

Fig. 4 is a detailed cross-section taken on the line 4-4 of Fig. 2.

It will be understood that my invention has to do with finishing the rough side of various papers such as are given a machine glazed finish on a Yankee drier and that such finishing operation is performed in combination with the glazing operation so as to enable economical production. The preceding and subsequent operations in the manufacture of this paper may be performed in any suitable or preferred manner Serial No. 103,891.

not inconsistent with the results to be obtained by the practice of my invention. I have therefore, for purpose of illustration, shown diagrammatically one embodiment of a Yankee machine for practicing my invention. In-this embodiment I employ a F ourdrinier wet part. The stock is conducted from the fiow box 5 over the, wire 6 which travels around the breast and. couch rolls 7 and 8, respectively, as is well under stood in this art. From the wet end of the machine the sheet or web passes to the press part and in this instance is picked up from the wire by the top felt 9 to the under side of which the web clings. The web will be carried by and between both the upper and lower felts 9 and 11, respectively, before entering the press rolls 12 and 13 which function in the well known manner to press out surplus water.

After passing the nib of the press rolls the web leaves the lower felt and clings to the under side of the upper felt and is carried around the tail roll 14 and then over the pressure roll 15 which presses the web against the periphery of the Yankee drying cylinder 16. This drier cylinder is heated by steam and its outside cylindrical surface has a very high polish. The roll 15 presses the wet web against the polished hard surface of the drier under a comparatively high pressure. By reason of this pressure of the web against the polished drier surface and because of the temperature of such surface the fibers undergo a certain amount of shrinkage and are so compressed against the highly polished surface that after drying thereon and removal therefrom they present a l'azed surface on the web. The other side of the web is rough, with the result that wax papers and other thin papers have a somewhat irregular formation of the fiber structure and the paper does not, therefore, have a uniform appearance.

My invention aims to improve the structure and appearance of the paper by finishing the rough side. This is done by an ad ditional operation while the paper still contains a moisture content sufficient to po1-- mit a formative action on the fibers on the rough side. In the preferred embodiment of my invention this operation is performed by a series of pressure rolls 17, 18 and 19. These extend entirely across the drier cylinder and are arranged to act in progression against the rough side of the web. These rolls are urged against the web under it pressure which is adjustable to suit the particular paper and to accomplish the desired result. \Vhile the pressure rolls may he metallic throughout, it is preferred that they be rubber-covered so that the action on the web and the surface of the drying cylinder is not too severe. These rolls are also arranged preferably within the first quarter of a revolution of the web travel on the drier to act on the-web while it still contains a moisture content sufficient to allow the rearranging or formation of the fibers under the action of such pressure to produce a smooth uniform surface. Furthermore, the pressure operation at this stage is beneficial to the glazing operation in that the web is urged against the polished surface and there is no crushing effect on the fibers as might occur if the web were dry. The use of a plurality of rolls acting progressively on the web enables a gradual formation of the fibers on the rough side in a much more effective manner than by the use of a single roll and without the detrimental tendencies toward breaking the web or injuring the polished surface of the drier.

In practice any suitable means may be employed for supporting the pressure rolls 17, 18 and 19 a'nd'for urging them against the web. In the present instance the roll 17 is journaled at each end in a bearing bracket 21 which is part of a lever 22 pivotally mounted at 23 on a bracket 24 attached to one of the side frame sills 24. The free end of the lever 22 is adjustably connected to said frame sill 24 through the agency of a compression spring 25, link 26 and hand wheel 27, one end of the link 26 being pivotally connected at 28 to said sill. It will be apparent viewing Fig. 2 that the'spring 25 exerts an upward pressure on the lever 22 which urges the roll 17 against the web, and that this pressure may be varied by adjustment of the hand wheel 27. The rolls 18 and 19 are mounted in a similar manner through the agency of levers 29 and 31, re-

spectively, suitably mounted on the framesill'and connected therewith at their free ends through adjustable spring connections similar to that described with reference to the lever 22.

After the web leaves the drying cylinder it may be passed through a stack of calender rolls 32 and then wound on a reel 33.

It is believed that the foregoing conveys a. clear understanding of my improved method of making machine glazed paper and of a practical and economical mechanism for practicing such method. This disclosure is, however, merely for purpose of illustration and it should be understood that in practice various changes might be made in the number and arrangement of the pressure rolls, the means for applying pressure thereto, and the organization of other parts employed in forming and finishing the web without departing from the spirit and scope of the invention as expressed in the appended claims, which -1. The method of making machine lazed paper consisting in producing a glaze effect on one side of the paper by a Yankee drying cylinder and finishing the rough side by the progressive action of pressure rolls thereon while drying on said cylinder.

2. The method of making machine glazed paper on a Yankee machine, including the operation of applying a plurality of pressure rolls acting progressively on the rough side of the paper web while it is on the drier cylinder and contains sufiicientmoisture content to permit formative working of the fibers by. such rolls.

3. The combination of a Yankee machine for making machine glazed aper, and means actin against the roug side of the paper during the glazing operation and while it contains a moisture content sufficient for formative working of the fibers for smoothin the rough side.

4. The com ination of a Yankee machine for making machine glazed paper, and pres sure rolls acting progressively against the rough side of the paper during the glazing operation and while it contains a moisture content sufiicient for formative working of the fibers for smoothing the rough side.

5. The combination of a Yankee machine for making machine glazed paper, and a plurality'of pressure rolls acting progressively against the rough side of the pa er web on the Yankee drler cylinder to finish said rough side.

' 6. The combination of a Yankee machine for making machine glazed aper, and pressure rolls acting progressive y on the rough side of the paper in its first quarter of a revolution of travel on the drier.

7. The combination of a Yankee machine for making machine glazed paper, and means for smoothing the rough side of the paper within the first quarter of revolution of'its travel on the drying cylinder.

8. In a paper making machine the combination of a polished drying cylinder, a felt for carrying the paper web to the cylinder, a roll for pressing the web against the cylinder to perform the initial step to produce the glazed effect, and a. plurality of pressure rolls acting progressively on the rough side of the web in proximity to its first quarter of revolution of travel on the cylinder to finish the rough side;

9. In a paper makin machine the combination with a polishe drying cylinder, 9. pressure roll for pressing the paper web against the cylinder, rubber-coated pressure rolls acting progressively on the rough side of the Web in proximity to its first quarter of revolution of travel on the drying cylinder to finish said rough side, and means for varying the pressure of said rubbercoated rolls.

10. A machine for making machine glazed paper comprising, in combination, a highly polished drying cylinder, a felt for carrying the paper web to said cylinder, a pressure roll for pressing said web through the intermediary of the felt onto the polished surface of the cylinder, a series of rolls arranged in proximity to the first quarter of a revolution of travel of the web on said cylinder, means individually urging each roll against the rough side of the web under a determined pressure whereby the rough side of the web will be finished by the progressive action of said rolls, an means for indlividually varying the pres ure on said rol s.

11. The method of making machine glazed paper consisting in producing a glazed efi'ect on one side of the paper by a Yankee drying cylinder and finishing the rough side by the action of pressure imposing means thereon while drying on said cylinder.

In Witness of the foregoingv I aflix my signature.

JOSEPH M. WARD. 

